Struct tidb_query_datatype::codec::mysql::json::Json

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pub struct Json {
    type_code: JsonType,
    pub value: Vec<u8>,
}

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Json implements type json used in tikv by Binary Json. The Binary Json format from MySQL 5.7 is in the following link: (https://github.com/mysql/mysql-server/blob/5.7/sql/json_binary.h#L52) The only difference is that we use large object or large array for the small corresponding ones. That means in our implementation there is no difference between small object and big object, so does array.

Fields

type_code: JsonType

value: Vec<u8>

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The binary encoded json data in bytes

Implementations

impl Json[−]

pub fn merge(bjs: Vec<JsonRef<'_>>) -> Result<Json>[−]

merge is the implementation for JSON_MERGE in mysql https://dev.mysql.com/doc/refman/5.7/en/json-modification-functions.html#function_json-merge

The merge rules are listed as following:

1. adjacent arrays are merged to a single array;
2. adjacent object are merged to a single object;
3. a scalar value is autowrapped as an array before merge;
4. an adjacent array and object are merged by autowrapping the object as an array.

See MergeBinary() in TiDB json/binary_function.go

impl Json[−]

pub fn new(tp: JsonType, value: Vec<u8>) -> Self[−]

Creates a new JSON from the type and encoded bytes

pub fn get_type(&self) -> JsonType[−]

Returns the JSON type

pub fn from_string(s: String) -> Result<Self>[−]

Creates a string JSON from a String

pub fn from_str_val(s: &str) -> Result<Self>[−]

Creates a string JSON from a &str

pub fn from_bool(b: bool) -> Result<Self>[−]

Creates a literal JSON from a bool

pub fn from_u64(v: u64) -> Result<Self>[−]

Creates a number JSON from a u64

pub fn from_f64(v: f64) -> Result<Self>[−]

Creates a number JSON from a f64

pub fn from_i64(v: i64) -> Result<Self>[−]

Creates a number JSON from an i64

pub fn from_ref_array(array: Vec<JsonRef<'_>>) -> Result<Self>[−]

Creates a array JSON from a collection of JsonRef

pub fn from_array(array: Vec<Json>) -> Result<Self>[−]

Creates a array JSON from a collection of Json

pub fn from_kv_pairs(entries: Vec<(&[u8], JsonRef<'_>)>) -> Result<Self>[−]

Creates a object JSON from key-value pairs

pub fn from_object(map: BTreeMap<String, Json>) -> Result<Self>[−]

Creates a object JSON from key-value pairs in BTreeMap

pub fn none() -> Result<Self>[−]

Creates a null JSON

pub fn as_ref(&self) -> JsonRef<'_>[−]

Returns a JsonRef points to the starting of encoded bytes

Trait Implementations

impl AsMySQLBool for Json[+]

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fn as_mysql_bool(&self, _context: &mut EvalContext) -> Result<bool>[−]

Evaluates into a MySQL logic value.

impl ChunkedVec<Json> for ChunkedVecJson[+]

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fn from_slice(slice: &[Option<Json>]) -> Self

fn from_vec(data: Vec<Option<Json>>) -> Self

fn push(&mut self, value: Option<Json>)

fn is_empty(&self) -> bool

fn with_capacity(capacity: usize) -> Self

fn push_data(&mut self, value: Json)

fn push_null(&mut self)

fn len(&self) -> usize

fn truncate(&mut self, len: usize)

fn capacity(&self) -> usize

fn append(&mut self, other: &mut Self)

fn to_vec(&self) -> Vec<Option<Json>>

impl Clone for Json[+]

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fn clone(&self) -> Json[−]

Returns a copy of the value.

pub fn clone_from(&mut self, source: &Self)[−]

Performs copy-assignment from source.

impl ConvertTo<Decimal> for Json[+]

fn convert(&self, ctx: &mut EvalContext) -> Result<Decimal>[−]

Port from TiDB’s types.ConvertJSONToDecimal

impl ConvertTo<Json> for i64[+]

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fn convert(&self, _: &mut EvalContext) -> Result<Json>[−]

Converts the given value to T value

impl ConvertTo<Json> for f64[+]

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fn convert(&self, _: &mut EvalContext) -> Result<Json>[−]

Converts the given value to T value

impl ConvertTo<Json> for Real[+]

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fn convert(&self, _: &mut EvalContext) -> Result<Json>[−]

Converts the given value to T value

impl ConvertTo<Json> for Decimal[+]

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fn convert(&self, ctx: &mut EvalContext) -> Result<Json>[−]

Converts the given value to T value

impl ConvertTo<Json> for Time[+]

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fn convert(&self, ctx: &mut EvalContext) -> Result<Json>[−]

Converts the given value to T value

impl ConvertTo<Json> for Duration[+]

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fn convert(&self, _: &mut EvalContext) -> Result<Json>[−]

Converts the given value to T value

impl ConvertTo<f64> for Json[+]

fn convert(&self, ctx: &mut EvalContext) -> Result<f64>[−]

Keep compatible with TiDB’s ConvertJSONToFloat function.

impl Debug for Json[+]

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fn fmt(&self, f: &mut Formatter<'_>) -> Result[−]

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Json[+]

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fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> where
    D: Deserializer<'de>, [−]

Deserialize this value from the given Serde deserializer.

impl Display for Json[+]

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fn fmt(&self, f: &mut Formatter<'_>) -> Result[−]

Formats the value using the given formatter.

impl Eq for Json

impl EvaluableRet for Json[+]

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const EVAL_TYPE: EvalType

type ChunkedType = ChunkedVecJson

fn cast_chunk_into_vector_value(vec: ChunkedVecJson) -> VectorValue[−]

Converts a vector of this concrete type into a VectorValue in the same type; panics if the varient mismatches.

impl From<Json> for ScalarValue[+]

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fn from(s: Json) -> ScalarValue[−]

Performs the conversion.

impl From<Json> for Datum[+]

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fn from(data: Json) -> Datum[−]

Performs the conversion.

impl FromStr for Json[+]

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type Err = Error

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Self, Self::Err>[−]

Parses a string s to return a value of this type.

impl Ord for Json[+]

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fn cmp(&self, right: &Json) -> Ordering[−]

This method returns an Ordering between self and other.

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#[must_use]pub fn max(self, other: Self) -> Self[−]

Compares and returns the maximum of two values.

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#[must_use]pub fn min(self, other: Self) -> Self[−]

Compares and returns the minimum of two values.

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#[must_use]pub fn clamp(self, min: Self, max: Self) -> Self[−]

Restrict a value to a certain interval.

impl PartialEq<Json> for Json[+]

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fn eq(&self, right: &Json) -> bool[−]

This method tests for self and other values to be equal, and is used by ==.

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#[must_use]pub fn ne(&self, other: &Rhs) -> bool[−]

This method tests for !=.

impl PartialOrd<Json> for Json[+]

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fn partial_cmp(&self, right: &Json) -> Option<Ordering>[−]

This method returns an ordering between self and other values if one exists.

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#[must_use]pub fn lt(&self, other: &Rhs) -> bool[−]

This method tests less than (for self and other) and is used by the < operator.

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#[must_use]pub fn le(&self, other: &Rhs) -> bool[−]

This method tests less than or equal to (for self and other) and is used by the <= operator.

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#[must_use]pub fn gt(&self, other: &Rhs) -> bool[−]

This method tests greater than (for self and other) and is used by the > operator.

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#[must_use]pub fn ge(&self, other: &Rhs) -> bool[−]

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl<'a> RawDatumDecoder<Json> for &'a [u8][+]

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fn decode(
    self,
    _field_type: &FieldType,
    _ctx: &mut EvalContext
) -> Result<Option<Json>>

impl ToInt for Json[+]

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fn to_int(&self, ctx: &mut EvalContext, tp: FieldTypeTp) -> Result<i64>[−]

Converts the given value to an i64

fn to_uint(&self, ctx: &mut EvalContext, tp: FieldTypeTp) -> Result<u64>[−]

Converts the given value to an u64

impl ToString for Json[+]

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fn to_string(&self) -> String[−]

Converts the given value to a String.

impl VectorValueExt<Json> for VectorValue[+]

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fn push(&mut self, v: Option<Json>)[−]

The generic version for VectorValue::push_xxx().